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Classification of light fastness and weather fastness of orange pigments and studies in waterborne latex paints / Artur Palasz in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4673 (02/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4673 (02/2022) . - p. 21-26 Titre : Classification of light fastness and weather fastness of orange pigments and studies in waterborne latex paints Type de document : texte imprimé Auteurs : Artur Palasz, Auteur Année de publication : 2022 Article en page(s) : p. 21-26 Langues : Anglais (eng) Catégories : Evaluation Latex Orange (couleur) Photostabilité Pigments Résistance aux conditions climatiques Revêtements en bâtiment Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The author discusses methods of assessing pigments, in this case orange pigments, in water-based architectural paints as façade paints for exterior and interior applications. Pigments are an extremely important group of raw materials used in the production of architectural paints. Both in the form of dry pigments and pigment concentrates (colourants), they allow for obtaining coloured coatings, which not only decorate our interiors, fences and façades, but also act as safety indicators, eg in paints for marking traffic routes or warning symbols. From an operational and economic point of view, their durability is extremely important, and knowledge about their durability to weather conditions is needed to select them for various applications, ranging from exposure to solar radiation, to operation at high temperatures. Due to the susceptibility of pigments as chemical compounds to changes in their properties, which are usually manifested in architectural paints, they must be properly classified and characterised for their proper use in formulations. In the article, I focused on the classification of pigments that exist on the market and their resistance to light (lightfastness) and weather factors (weatherability), as well as on case studies of the exposure of three different organic orange pigments using various methods of exposure to artificial (laboratory) light sources and accelerated action of weather conditions. The article is dedicated to the methods of assessing pigments, in this case orange pigments, in water-based architectural paints as façade paints for external application, fade due to weather conditions and for interior paints fade due light exposure through window glass. This paper also exemplifies the resistance to such factors under simulated laboratory conditions, in the form of data that the paint industry needs to develop weatherability and Iightfastness stable latex paint coatings for both indoor and outdoor use. These data should usually be included in guide formulations and start point formulations, which significantly accelerate R&D work in paint production companies, and above all, make a decision on whether to accept a given raw material for testing. Note de contenu : - LIGHTFASTNESS TESTS OF PIGMENTS : Exposure methods according to ASTM D4303 - Assessment of colour changes and classification of pigments - MARKET REQUIREMENTS FOR PAINTS AND COATINGS : UV exposure - EXPERIMENTAL : Pigments for studies - Paints for studies - TESTING PROGRAMME - TEST RESULTS - DISCUSSION OF TEST RESULTS En ligne : https://drive.google.com/file/d/1ugJlgaQPeYJBq35jmlei36qMdNELdT3L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36971 [article]

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Hard minerals enhance powder coating performance / Kevin M. Biller in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4673 (02/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4673 (02/2022) . - p. 32-34 Titre : Hard minerals enhance powder coating performance Type de document : texte imprimé Auteurs : Kevin M. Biller, Auteur Année de publication : 2022 Article en page(s) : p. 32-34 Langues : Anglais (eng) Catégories : Alumine Carbure de silicium Charges (matériaux) Formulation (Génie chimique) Hydroxyalkylamide Néphéline Syénite Polyesters Résistance à l'abrasion Revêtement poudre -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : The author discusses the use of hard minerals to enhance powder coating performance. Powder coatings continue to expand their share of the industrial coatings market mainly because of their high performance combined with excellent economics. The application of powder coatings can be highly efficient as the oversprayed material can be collected and recycled back into the finishing process. This minimises waste streams, which allows powder's environmental profile to align well with both corporate and regulatory sustainability goals. Experts forecast robust growth of powder coatings. Global sales of powder coatings in 2021 are estimated to be around US$12.5bn (€10.6bn) with a volume of approximately 5.5bn lbs. (2.5M tonnes). Growth is projected at 3.9 to 5.4% per annum for the next five years. Abrasion resistance in powder coatings is an important property. Some powders are used to coat items that are subjected to extreme environments such as oil and gas transmission pipelines, whereas other powder coatings are used in decorative applications where appearance is critical. These decorative finishes must maintain their appearance after the handling of parts during assembly and everyday wear and tear. Improving abrasion resistance is a sought-after goal of powder coating formulators, whether for functional or aesthetic purposes. The use of high hardness minerai fillers is considered one avenue to increase abrasion resistance in powder coatings. This study examines the effect that white fused alumine, nepheline syenite and silicon carbide have on the abrasion resistance of a common powder coating system based on polyester-HAA (hydroxy-alkyl amide) chemistry. Note de contenu : - WESTER MINERALIEN : Objective - Materials - Formulation platform - Processing conditions - RESULTS : Processability - Aesthetics - Rheology - Colour - Mechanical properties - Abrasion resistance En ligne : https://drive.google.com/file/d/1B1yHJEY9fCmu0wUDOmIOxhNoLrqVfbd7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36972 [article]

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Improved corrosion protection of acrylic waterborne coating by doping with microencapsulated corrosion inhibitors / Jacob Ress in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4673 (02/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4673 (02/2022) . - p. 39-44 Titre : Improved corrosion protection of acrylic waterborne coating by doping with microencapsulated corrosion inhibitors Type de document : texte imprimé Auteurs : Jacob Ress, Auteur ; Ulises Martin, Auteur ; M. Bastidas, Auteur Année de publication : 2022 Article en page(s) : p. 39-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acier au carbone Anticorrosifs Anticorrosion Chlorures Emulsions multiples Encapsulation Métaux -- Revêtements protecteurs Polyacryliques Revêtements en phase aqueuse:Peinture en phase aqueuse Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : A waterborne acrylic coating doped with pH sensitive colophony microcapsules containing corrosion inhibitors was studied on carbon steel plates. The changes in the physical properties of the coatings were studied. The microcapsule coating specimens maintained more noble E.„ values compared to the control in deionised water and simulated concrete pore solutions with -513 and -531 mVSCE, respectively. Additionally, the microcapsule polarisation results for both pH12.6 and 6.2 electrolyte solutions showed lowerieO values of 1.20 x 10-' and 3.24 x 10-6 A . cm', respectively, compared to the control sample (1.15 x 10-5 and 4.21 x 10-5 A . cm2). Therefore, the microcapsule coating provided more protection from chloride attack on the substrate as well as the deleterious effects of low pH on carbon steel. The electrochemical impedance spectroscopy analysis corroborated the DC polarisation results, showing increased corrosion resistance for the microcapsule coated specimens compared to the control. Moreover, the Rpore and Ra are much higher than the control, indicating the protection of the inhibitors. The Ced, also shows lower values for the microcapsule coating than the control, showing a more protective and less doped double layer. Note de contenu : - Table 1 : The composition of carbon steel speciment (wt%) - Table 2 : Composition of waterborne acrylic coating (wt%) - Table 3 : Electrochemical parameters calculated by Tafel fitting from potentiodynamic polarisation for acrylic coating containing microcapsules exposed to 3.5 wt°/0NaCl contaminated environment in DI water (pH 6.8) and SCPS (pH 12.6). The standard deviation is presented in the parenthesis - Table 4 : EIS fitting values obtained for acrylic coated control steel panels and MC modified acrylic coated panels exposed to 3.5 wt% NaCI contaminated environment in DI water (pH 6.8) and SCPS (pH 12.6) using the equivalent circuit presented in Figure 8. The standard deviation is presented in the parenthesis En ligne : https://drive.google.com/file/d/1InjEH6A4EGq-s7P6M0KuLbo8bkkKI446/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36973 [article]

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Healing performance of a self-healing protective coating according to damage width / Dong-Min Kim in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4673 (02/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4673 (02/2022) . - p. 45-49 Titre : Healing performance of a self-healing protective coating according to damage width Type de document : texte imprimé Auteurs : Dong-Min Kim, Auteur ; Lee Junseo, Auteur ; Ju-Young Choi, Auteur ; Seung-Won Jin, Auteur ; Kyeong-Nam Nam, Auteur ; Hyeong-Ju Park, Auteur ; Seung-Hyun Lee, Auteur ; Chan-Moon Chung, Auteur Année de publication : 2022 Article en page(s) : p. 45-49 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de dommages (matériaux) Encapsulation Essais (technologie) Essais accélérés (technologie) Huile de lin L'huile de lin ou "huile de graines de lin" est une huile de couleur jaune d'or, tirée des graines mûres du lin cultivé, pressées à froid et/ou à chaud ; parfois elle est extraite par un solvant, en vue de l'usage industriel ou artistique, principalement comme siccatif, ou huile auto-siccative. Les utilisations de l'huile de lin dérivent de sa richesse en acides gras polyinsaturés, en particulier en acides linolénique et linoléique, qui lui doivent leur nom. L'huile de lin polymérise spontanément à l'air, avec une réaction exothermique : un chiffon imbibé d'huile peut ainsi, dans certaines conditions, s'enflammer spontanément. Pour ses propriétés de polymère, l'huile de lin est employée seule, ou mélangée à d'autres huiles, résines et solvants, et est utilisée en tant que : Imprégnateur et protecteur des bois à l'intérieur comme à l'extérieur : protection contre l'humidité, les champignons et insectes, et contre la poussière par son caractère antistatique, composant de certains vernis de finition, liant de broyage pour la peinture à l'huile, agent plastifiant du mastic de vitrier, agent durcisseur de diverses préparations, agent de cohérence et liant dans la fabrication du linoléum. Humidité -- Absorption:Eau -- Absorption Ions chlorure Matériaux cimentaires -- Revêtements protecteurs Microcapsules Pénétration (physique) Polyéthylène greffé anhydride maléique Revêtement autoréparant Index. décimale : 667.9 Revêtements et enduits Résumé : Although self-healing protective coatings have been widely studied, systematic research on healing performance of the coating according to damage width has been rare. In addition, there has been rare reports of self-healing of the protective coating having damage width wider than 100pm. In this study, self-healing performance of a microcapsule type self-healing protective coating on cernent mortar was studied for the coating with damage width of 100-300pm. The effect of capsule-loading (20wt%, 30wt% and 40wt%), capsule size (65,102 and 135pm mean diameter) and coating thickness (50, 80 and 100pm thick undercoating) on healing efficiency was investigated by water sorptivity test. Accelerated carbonation test, chloride ion penetration test and scanning electron microscope (SEM) study were conducted for the self-healing coating with a 300pm wide damage. Healing efficiency of the self-healing coating decreased with increasing damage width. As capsule-loading, capsule size or coating thickness increased, healing efficiency of the self-healing coating increased. Healing efficiency of 76% or higher was achieved using the self-healing coating with a 300pm wide scratch. The self-healing coating with a 200pm wide crack showed healing efficiency of 70% or higher. The self-healing coating having a 300pm-wide scratch showed effective protection of the substrate mortar from carbonation and chloride ion penetration, which was supported by SEM study. Note de contenu : - MATERIALS AND METHODS : Materials - Instruments - Microencapsulation of linseed oil - Preparation of coating samples - Vater sorptivity test - Determination of healing efficiency - Accelerated carbonation test - Chloride ion penetration test - RESULTS AND DISCUSSION : Microcapsules - Water sorptivity test - Other performances of the self-healing coating with damage width of 300µm - Table 1 : Variable parameters of the coating samples En ligne : https://drive.google.com/file/d/1NwpVSD-cYsSHt18KguwcleHTKg7yDeHh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36974 [article]

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Polymer Paint Colour Journal Vol. 212, N° 4673 URL